EP 1492373 A2 20041229 - Method and apparatus for hard handoff in a CDMA system
Title (en)
Method and apparatus for hard handoff in a CDMA system
Title (de)
Verfahren und Vorrichtung zum harten Weiterreichen in einem CDMA-System
Title (fr)
Procédé et appareil de transfert brusque dans un système AMRC
Publication
Application
Priority
- EP 97929732 A 19970523
- US 65274296 A 19960523
Abstract (en)
The cellular communication system includes a number of base stations through which a mobile unit communicates. The mobile unit maintains a list of active base stations with which it can communicate. One of the active stations is in communication with the mobile and uses this communication to measure the round-trip-delay between mobile and station. This delay is compared with a threshold and if this is exceeded, and the base station is a boundary station, then a hard hand-off is executed. The mobile can also monitor candidate base stations and if a triggering pilot signal is detected a hand-off can be triggered. Preferably the handoff can be between base stations controlled by different mobile switching centres.
In a communications network a network user communicates through a remote unit with another user via at least one base station. The communications network includes a first mobile switching centre for controlling communications through a first set of base stations including a first base station. A list of active base stations is stored at the remote unit, the list comprising an entry corresponding to each base station with which active communication is established. The base station has an entry on the list of active base station and is a reference base station. The remote unit stores a list of candidate base stations comprising an entry corresponding to each base station through which active communication may be established. A hand off of an active communication signal is initiated from the first base station to the second base station if a pilot signal of the second base station on the list of candidate base stations corresponds to a triggering pilot signal.
IPC 1-7
IPC 8 full level
H04W 24/02 (2009.01); H04W 36/14 (2009.01)
CPC (source: EP US)
H04W 36/30 (2013.01 - US); H04W 36/302 (2023.05 - EP); H04W 36/00837 (2018.08 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 9744984 A2 19971127; WO 9744984 A3 19971231; AT E384410 T1 20080215; AT E509490 T1 20110515; AU 3372297 A 19971209; AU 717479 B2 20000330; BR 9712089 A 19990831; CA 2256425 A1 19971127; CN 100592818 C 20100224; CN 1215736 C 20050817; CN 1225786 A 19990811; CN 1297175 C 20070124; CN 1561140 A 20050105; CN 1968525 A 20070523; DE 69738471 D1 20080306; DE 69738471 T2 20081113; EP 0951793 A2 19991027; EP 0951793 B1 20080116; EP 1492373 A2 20041229; EP 1492373 A3 20060531; EP 1492373 B1 20110511; ES 2299185 T3 20080516; FI 982520 A0 19981120; FI 982520 A 19990122; HK 1023676 A1 20000915; IL 127199 A0 19990922; JP 2000511380 A 20000829; JP 3933696 B2 20070620; RU 98123191 A 20000927; US 5848063 A 19981208
DOCDB simple family (application)
US 9709305 W 19970523; AT 04016332 T 19970523; AT 97929732 T 19970523; AU 3372297 A 19970523; BR 9712089 A 19970523; CA 2256425 A 19970523; CN 200410069658 A 19970523; CN 200610108582 A 19970523; CN 97196164 A 19970523; DE 69738471 T 19970523; EP 04016332 A 19970523; EP 97929732 A 19970523; ES 97929732 T 19970523; FI 982520 A 19981120; HK 00102368 A 20000419; IL 12719997 A 19970523; JP 54298797 A 19970523; RU 98123191 A 19981223; US 65274296 A 19960523